Perhaps you should try some spelling variations:
teaching object » teaching subject (Expand search), teaching project (Expand search), learning object (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
case teaching » care teaching (Expand search), face teaching (Expand search), game teaching (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (Expand search)
decrease il » decreased il (Expand search), decrease hiv (Expand search), decrease of (Expand search)
il decrease » l decrease (Expand search), will decrease (Expand search), oil decreases (Expand search)
rate case » rate caused (Expand search), rate based (Expand search), state case (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease in decrease il decrease ) OR ( decrease rate case teaching object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease il decrease ) OR ( decrease rate case teaching object ))*.